1. Reformat the code:
Adapt the indentation, whitespace, and overall structure to your preferences. AIs have a default formatting style that may be recognizable.
2. Rewrite portions of the code:
Even if the code is functional, try rewriting some parts your own way. This will show that you've understood and absorbed the logic, not just copied it.
3. Integrate your own logic:
Don't use AI to generate entire blocks of code. Use it for specific pieces, then integrate them into your existing project structure and overall logic.